A plane lands at 50.0 m/s,and its brakes are capable of slowing it down at 10.0 m/s².How far does it go (in m)between touching down and stopping? A)9.81 B)50. C)125. D)500. E)250.

Question

Quizplus · Accepted Answer

Using the equation of motion, 
v^2=u^2+2as
where 
u = initial velocity = 50.0m/s
v = final velocity = 0 (since the plane stops)
a = acceleration = -10.0m/s^2 (since the brakes slow down the motion)
s = distance covered
Substituting the values,
0^2=50.0^2 + 2(-10.0)s
Solving for s, 
s = 125m. 
Therefore, the answer is C).

A Plane Lands at 50